Zhengzhou Hengyang Industrial Co., Ltd

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Fundamental Concepts Of Food Industry Drying Process Custom Standard

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Fundamental Concepts Of Food Industry Drying Process Custom Standard

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Brand Name :Hengyang
Model Number :HC-216
Certification :ISO9001
Place of Origin :China
MOQ :1
Price :5500-67800USD/set
Payment Terms :T/T
Supply Ability :300Sets/month
Delivery Time :20-60 days
Packaging Details :Negotiated
Voltage :custom standard
Condition :New
Warranty :TWO YEARS
Type :Drying
After-sales service provided :Engineer oversea service
Application :food materials
Product name :Fundamental Concepts of Food Industry Drying Process
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Fundamental Concepts of Food Industry Drying Process

Various processing methods are there for preservation of food processing units like Freezing, canning, preserving in syrup, food irradiation, salting, vacuum packaging, dehydration or drying.

Drying means removal of a liquid from a liquid/ semi-solid/ solid to produce solid product by thermal energy input causing phase change. Sometimes converts solid moisture into vapor by sublimation process. For example freeze drying with application of heat.

The process of drying needed for the purposes of storage and preservation, reduction in cost of transportation etc.

Fundamental Concepts Of Food Industry Drying Process Custom Standard

Drying is a complex Thermal process. Drying occurs by supplying heat to the wet feedstock in the form of effecting vaporization of the liquid.

Energy input may be supplied by the following

Conduction (contact or indirect dryers)

Convection (direct dryers)

Radiation (Placing the wet material in radio frequency electromagnetic field or in a microwave)

Microwave and Radio Frequency Fields

Combination of above methods

Moisture output comes out by the following ways

Vapor diffusion.

Liquid diffusion

Surface diffusion

Capillary flow (Permeability)

Poiseuille flow

Combination of above

Most of the dryers are of the convection type with direct combustion gases or hot air as the drying medium because water is the most common solvent removed in dryers

Direct Dryers (Convective): Drying medium directly contacts material to be dried and carries evaporated moisture.

Fundamental Concepts Of Food Industry Drying Process Custom Standard

Indirect dryers (Contact or conduction)

Fundamental Concepts Of Food Industry Drying Process Custom Standard

Initial period

In this first phase sensible heat is transferred to the product and the contained moisture. During this period mostly free moisture being removed with the rate of evaporation increases dramatically .

Constant rate period

In this second phase when the free moisture continue to exist on the surfaces and the rate of evaporation alters very little as the moisture content reduces. During this period, evaporation proceeds at a constant rate.

Falling rate period

In the third phase migration of moisture from the inner interstices of each particle to the outer surface becomes the limiting factor that reduces the drying rate. The film of moisture becomes exhausted and evaporation slows due to reduced surface area.

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